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upas/runq: wait for bounce sender to exit (thanks grizi)

when we send a return message, we need to wait for the
message to exit before we clean up the state files.

--- a/sys/src/cmd/upas/q/runq.c

+++ b/sys/src/cmd/upas/q/runq.c

@@ -577,6 +577,7 @@

 	char buf[256], attachment[Pathlen], *sender;

 	int fd, pfd[2];

 	long n;

+	Waitmsg *wm;

 	String *s;

 	if(av[1] == 0 || av[2] == 0){

@@ -597,7 +598,7 @@

 		return -1;

 	}

-	switch(rfork(RFFDG|RFPROC|RFENVG|RFNOWAIT)){

+	switch(rfork(RFFDG|RFPROC|RFENVG)){

 	case -1:

 		logit("runq - fork failed", w, name, av);

 		return -1;

@@ -633,6 +634,8 @@

 				break;

 			if(write(pfd[1], buf, n) != n){

 				close(fd);

+				wm = wait();

+				free(wm);

 				return -1;

 			}

 		}

@@ -639,6 +642,8 @@

 		close(fd);

 	}

 	close(pfd[1]);

+	wm = wait();

+	free(wm);

 	return 0;

 }